From: Hugh Sasse Staff Elec Eng <hgs@...>
Date: 2003-02-12T03:53:16+09:00
Subject: Re: Portable FQDM in Ruby?

On Wed, 12 Feb 2003, Daniel Berger wrote:

> Hugh Sasse Staff Elec Eng wrote:
>
> > I am trying to get the fully qualified domain name of a machine in a
> > way that is posrtable in Ruby.
        [...]
> > I'm trying to take advantage of the portability of ruby here, to
> > avoid lots of 'case RUBY_PLATFORM ...' code.
> >
> >         Thank you,
> >         Hugh
>
> Hi Hugh,
>
> The answer is, "I doubt it".
>
> The info returned from Socket.getaddrinfo (on *nix systems) is the
> addrinfo struct information (netdb.h).  Specifically, the ai_canonname
> char ptr.  According to Unix Network Programming Vol I, by Richard
> Stevens, "...the ai_canonname member of the first returned structure
> points to the canonical name of the host.  In terms of the DNS this is
> *normally* the FQDN." (emphasis mine).  The same is likely true for
> Windows systems (WSDATA?), but I'm not sure.

OK. I've not really explored DNS in depth yet.
>
> Also note that the nodename, from the utsname struct, is even less
> reliable (Stevens, p. 250).

OK.  I'll try another solution that doesn't try to find this sort of
thing out.
>
> Regards,
>
> Dan
>
>
        Thank you,
        Hugh